Method of cleaning fiber-press dies



. G. J. MANSON. METHOD OF CLEANING FIBER PRESS DlES.. APPLICATION FILED M AY3,1919.

Patented Apr. 18, 1922.

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H7TY157 G. l. MANSON. METHOD OF CLEANlNG FIBER PRESS DIES. APPHCATION man MINI-3.1919.

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METHOD OF CLEANING FIBER PRESS DIES.

APPLICATION FILED MAY 3, 1919- Patented Apr. 18, 1922.

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3 SHEETSSHEET 31 UNITED STATES PATENT ()FFICE.

GEORGE JAMES MANSON, or TonoNTo, ONTARIO, CANADA.

.1VIETI-IOD or CLEANING FIBER-PRESS nrns.

Specification of Letters Patent.

Application filed May 3, 1919. Serial No. 294,627.

(GRANTED IINDER THE PROVISIONS OF THE ACT OF MARCH 3,1921, 41 STAT. L, 1313.}

T 0 all whom it may concern 4' Be it known that'I, GEORGE JAMEsMA SON, a subject of the King of Great Britain, and resident of the city of Toronto, in the Province of Ontario, Dominion of Canada, have invented certain new .anduseful Imrovements in Methods of Cleaning Fiberress Dies, of which the followingis a specification.

This invention relates to improvements in method of cleaning fiber press dies, and the objects of the invention are to avoid clogging of the drainage surface in a. dle, and to enable the dies to operate on fibers of a resinous character such as are produced from bark of wood when the bark is ground.

with the remainder of the wood, and the invention consists in sprinkling the surface of' the dies between the'pressing operations as hereinafter described in detail in the accompanying specification and drawings.

The drawings show'a set ofdies and .apparatus for carrying out the sprinklingoperation.- I

In the drawings: I

Figure 1 is a sectional elevation of a fiber press. 3

Figure 2 is a sectional plan.

Figure 3 is a cross sectional elevation.

Figure 4 is a sectional detail of the water feeding means.

Figure 5 is a sectionaldetail of the retractor and carriage for the sprinkling means.

Figure 6 shows the same parts as in Figure 5 with the retractor and carriage beneath the dies. 7 H

Figure 7 is a sectional detail of the dies closed.

Figure 8 is a sectional detail of a portion of the cam track controlling the sprinkling device.

Figure 9 is a sectional view through the controlling valve.

In the drawings like characters of reference indicate corresponding parts in all the figures. 1

Referring to the drawings, A represents a fiber ress having an upper die B, a lower die and a side or wall die'D which are operated by suitable hydraulic means to press a sheet of fiber in the manner well known in the art. In the embodiment illus- 12 supporting the die. The upper die B is connected to a platform on the side posts 14:,the lower extremities of atented Apr. 18, 1922..

13 fixedly mounted which are connected by a cross bar 15 to the cylinders 10'. The side or wall die D is also actuated by hydraulic means-such as the cylinder 16 having plungers 17 connected to opposite sides of the wall die. a

In the present operation the closed position will be as indicated iii-Figure .7' and the open position as shown in Figure 1. The pulp or other fiber stock to be pressed "into a sheet or other article maybe fed into the conduit 18 which opens into a port 19 in the wall die, the retraction of the wall die over the die B cutting off the port and supply of fiber at the proper point. It will be understood, however, as far as the present invention is concerned the dies and method of operatingthe same will be of any suitable character.

E represents a sprinkling device reciprocable between. the dies B and C when they are separated. The form of sprinkling device I have shown comprises a. transversely extending pipe 20 perforated in rows along the top and bottom whereby when the water pressure is on, the surface of both the upper and lower dies will be sprinkled. This pipe is supplied with water with a suitable flexible connection including a telescopic. supply pipe 21 extending through a gasket 22 in the end ofthe pipe 20 connected to a suitable supply pipe 23. The pipe 20 is supported from a reciprocable retractor carriageFhaving wheels 24 which run in a track 25, the movement of the retractor carriage being controlled by suitable means such as the driving pinion 26 engaging the rack 27 connected to the carriage the rack receiving additional support from suitable rollers 28.

Means are provided for stripping the pressed sheet from the retractor carriage when outside the die whereby it may be transferred to a suitable conveyor. These means comprise a pivoted stripping member 31 pivotally mounted on the cross shaft 32 and adapted to assume thejinclinedposition shown inFigure 5 as the carriage F passes beneath it whereby on the return motion of the carriage it will strip the sheet of pulp 33 therefrom and permit it to drop onto the conveyor G a The operation of the sprinkling deviceis controlled in such a way as to cause it to operate only when it is moving on the return direction across the face ofthe dies. It is not desirable that the sprinkling should take place on the forward motion, since 'while the sprinkler is moving in this direction the pressed sheet will be held against the surface of the die. The controlling means which I have shown comprise a valve 35 of any suitable type having a stem 36 normally spring held in open position by means of a spring 37 extending between the collar 38 on the stem 36 and the top :of the valve casing 39. The. stem 36 carries a roller 40 at the top controlled by a cam track 41. This cam track ll includes a lower track 42 having a central aperture through which the stem 36 may pass, but through which the roller 40 may not pass, and an upper track' l3 which projects beyond the upper track and is formed at one portion with an inclined section 44; which'brings it into alignment with the lower track.

On the inward movement the roller runs on the lower track 42; when it'reaches the end of this track the spring 37 causes the valve stem to move outwardly, opening the valve and causing the sprinkler to operate on the return movement. While the sprinkler is operating the roller 4:0 runs on the track 4:23, passes down the inclined portion 44. to the lower portion 45 of the track 43. On the return movement the roller is prevented from passing up the inclined portion 14: by means of a spring trap member f hinged to the end of the track 42 and spring held in alignment therewith as shown in Figure 8, whereby when the trap' member is in position'there will be no passage from the section 4C5 of the track43 to the main portion thereof, the trap, however, being free to swing downwardly to permit of movement from the upper track to the lower track.

, Theoperation'of the press takes place in the usual way, the pulp stock being fed betweenthe dies and the pressure being exerted by hydraulic means, while the water Finally the pressed sheet or article is caused by suction to adhere to the upper die when the dies are separated, suction being exerted through the passageways or ports in the die through which the water was withdrawn. WVhen the sheet is in this position the rctractor F-comes between the dies, the suction is then released to permit the sheet to drop onto the retractor carriage and on withdrawal of the retractor carriage the sprinkler operates as previously described to sprinkle the surface of both the upper and lower die, the sprinkling operation ceasing as soon as the roller passes down the inclined portion 4.4 to the lower portion 45 of the track .83. When the retractor car- 'riage reaches its outermost position the article is stripped therefrom by means of the pivoted stripping member 31; e

As many changes could be made in the above construction and 'inany apparently widely different embodiments of my inven tion, within the scope of the claim, constructed without departing from the spirit or scope thereof, it is intended that all'matter contained in the accompanying specification and drawings shall be interpreted as illustrative and not in alimiting sense. 7

What I claim as my invention'is:

The herein described method of operating reciprocating fiber press dies which comprises sprinkling' the-surface of the die between pressing operations.

In witness whereof I have hereunto set my hand in the presence of two witnesses. GEORGE JAMES MANSON. Witnesses: RUSSEL S. SMART, P. GARnoW. 

